Manufacture of nonknocking motor fuels from liquid hydrocarbons by catalytic cracking



Patented Mar. 7, 1944' FROM LIQUID IIYDBOCABBQNS BY FUELS CATALYTIC CRACKING I Gerhard Free and Wilhelm w. 'Fiiner. Lndwlgshafen-on-the-Rhine Alien Property Custodian v vested in the No mm...- Application my 14, me. Serial a...

' 335,118. in Germany January 9, use

6Claims. (01. 196-52)" The present invention relates to a process for the manufacture of non-knocking motor fuels from liquid hydrocarbons by catalytic cracking;

As was known, non-knocking motor fuels are obtained by passing hydrocarbon oils over cracking catalysts at high temperatures. The use of catalysts containing silica or hydrosilicates. suchfor example as naturalfor artificial silicates, especially'aluminum or magnesium silicates. has also been proposed. These catalysts, however, frequently fall of! in efilciency even after a short use 7 and must then be reactivated. a

We have now found that the emciency of th said catalysts may be maintained for a considerably extended time by passing the initial materials thereover in a vaporous state along with 300 atmospheres. .Provision may also be made for the pressure to rise 'or fall duringthe operasases'having an oxidizing action and which may 1 also contain saturated and/or unsaturated caseous hydrocarbons, at a temperature of between 300 and 500' C. The gases having an oxidizing action may also be added intermittently, but the addition must not go beyond the explosion limit.

Among suitable initial materials we may menl t'ion, for.e xample', benaines, middle oils or vaporizable. heavy oils from mineral oils, tars or destructive hydrogenation products of carbons-' ceous substances, as for example of solid and liquid fuels. 'i

In carrying out the process according to the present invention, these substances are passed over the catalyst in a vaporous state together with an oxi fi l I I. for example air. In the case of air,;for example, the addition amoimts to 50 to 500 volumes of air for each volume of the initial material in the liquid state. Instead of air. an equivalent amount of other gases havi l oxidising action ample'oxides of nitrosen.

tion. i

The following example serves to illustrate how,

. the present invention may be carried out in practlce, but the invention is not restricted to this example.

Example A gas oil obtained from paraflin-base'crude oil is passed in the vapor phase together withair over an aluminum silicate catalyst prepared by mixing solwith a solution of aluminum nitrate, precipitating with ammonia and heating 4 the precipitate, the passage oi the gases being carried out at 460 C. and at a rate or 1 liter of oil (calculated as a liquid) and 200 liters of air per each 2 liters of catalyst space and per hour.

The resulting product contains 25 per cent of gasoline having an octane-number of. 'I'Ldetermined byv the motor method. The catalyst re-' its activity at least twice 'as long as when carrying out the operation in the absenceof I What we claim is:

, 1.,The process of manufacturing a non-knocking motor fuel from a liquid vaporirable hydrocarbon oil, which comprises passing saidhvdrocarbon all completely vaporized at a temperature 'btween390'and500' C.inthepresenceofagas having an oxidizing action over a stationary hydrosilicate'catalyst under-conditions suitable to effect a substantial conversion of said hydrocarbon oil into gasoline and reactivating said catalyst after at least twice the time for which the may be employed, for exv as catalysts we may mention natural bieachingearths which preferably have been activated by a treatment with acid. or artificial catalysts 4 containing silicic acid. such as are described, for example in the unending-application Ser. No.

222,144, filed July 30, 1988.

The reaction is carried out in general at a temperature of between 400' and 500' 6.; advantageously while increasing the temperature in the course of the reaction, and.-under atmospheric orincreasedpressureforexamplefrcmitotii atmospherescrevenhigheaforexampleliliito catalyst retains its activity inthe absence of said sas.

'2. The process as claimed in-claim 1, wherein the catalyst is an activated bleaching earth.

3. The process as claimed in claim 1, wherein the catalyst is an artificial aluminum silicate.

e. The process as claimed in claim 1, wherein Y the catalyst is an artificially prepared magnesium silicate.

5. Tne process as claimed in claim 1, wherein the gas ying an oxidizing action contains a gaseous hydrocarbon.

6..1'ne process as claimed in claim 1. wherein alrisusedasthcgashavinganoxidiaingaction.

assumes-ans. urn-ministritium. 

